What causes backpressure?
Backpressure is created when pressure in a non-potable system such as in re-circulating pump system, equipment containing soap, acid, or antifreeze, exceeds that in the potable water system that is supplying water to the equipment. Also, landscape reclaim water or untreated water, operating at a higher delivery pressure or (PSI) than the potable water delivery system. This can force the potable water system to reverse its direction of flow through the cross-connection therefore causing non-potable substances to enter the potable water system.
